1 // -*- C++ -*- Exception handling routines for throwing.
2 // Copyright (C) 2001-2016 Free Software Foundation, Inc.
4 // This file is part of GCC.
6 // GCC is free software; you can redistribute it and/or modify
7 // it under the terms of the GNU General Public License as published by
8 // the Free Software Foundation; either version 3, or (at your option)
11 // GCC is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
25 #include <bits/c++config.h>
26 #include "unwind-cxx.h"
28 using namespace __cxxabiv1
;
32 __gxx_exception_cleanup (_Unwind_Reason_Code code
, _Unwind_Exception
*exc
)
34 // This cleanup is set only for primaries.
35 __cxa_refcounted_exception
*header
36 = __get_refcounted_exception_header_from_ue (exc
);
38 // We only want to be called through _Unwind_DeleteException.
39 // _Unwind_DeleteException in the HP-UX IA64 libunwind library
40 // returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT
41 // like the GCC _Unwind_DeleteException function does.
42 if (code
!= _URC_FOREIGN_EXCEPTION_CAUGHT
&& code
!= _URC_NO_REASON
)
43 __terminate (header
->exc
.terminateHandler
);
45 #if ATOMIC_INT_LOCK_FREE > 1
46 if (__atomic_sub_fetch (&header
->referenceCount
, 1, __ATOMIC_ACQ_REL
) == 0)
49 if (header
->exc
.exceptionDestructor
)
50 header
->exc
.exceptionDestructor (header
+ 1);
52 __cxa_free_exception (header
+ 1);
53 #if ATOMIC_INT_LOCK_FREE > 1
58 extern "C" __cxa_refcounted_exception
*
59 __cxxabiv1::__cxa_init_primary_exception(void *obj
, std::type_info
*tinfo
,
60 void (_GLIBCXX_CDTOR_CALLABI
*dest
) (void *))
62 __cxa_refcounted_exception
*header
63 = __get_refcounted_exception_header_from_obj (obj
);
64 header
->referenceCount
= 0;
65 header
->exc
.exceptionType
= tinfo
;
66 header
->exc
.exceptionDestructor
= dest
;
67 header
->exc
.unexpectedHandler
= std::get_unexpected ();
68 header
->exc
.terminateHandler
= std::get_terminate ();
69 __GXX_INIT_PRIMARY_EXCEPTION_CLASS(header
->exc
.unwindHeader
.exception_class
);
70 header
->exc
.unwindHeader
.exception_cleanup
= __gxx_exception_cleanup
;
76 __cxxabiv1::__cxa_throw (void *obj
, std::type_info
*tinfo
,
77 void (_GLIBCXX_CDTOR_CALLABI
*dest
) (void *))
79 PROBE2 (throw, obj
, tinfo
);
81 __cxa_eh_globals
*globals
= __cxa_get_globals ();
82 globals
->uncaughtExceptions
+= 1;
83 // Definitely a primary.
84 __cxa_refcounted_exception
*header
=
85 __cxa_init_primary_exception(obj
, tinfo
, dest
);
86 header
->referenceCount
= 1;
88 #ifdef __USING_SJLJ_EXCEPTIONS__
89 _Unwind_SjLj_RaiseException (&header
->exc
.unwindHeader
);
91 _Unwind_RaiseException (&header
->exc
.unwindHeader
);
94 // Some sort of unwinding error. Note that terminate is a handler.
95 __cxa_begin_catch (&header
->exc
.unwindHeader
);
100 __cxxabiv1::__cxa_rethrow ()
102 __cxa_eh_globals
*globals
= __cxa_get_globals ();
103 __cxa_exception
*header
= globals
->caughtExceptions
;
105 globals
->uncaughtExceptions
+= 1;
107 // Watch for luser rethrowing with no active exception.
110 // Tell __cxa_end_catch this is a rethrow.
111 if (!__is_gxx_exception_class(header
->unwindHeader
.exception_class
))
112 globals
->caughtExceptions
= 0;
115 header
->handlerCount
= -header
->handlerCount
;
116 // Only notify probe for C++ exceptions.
117 PROBE2 (rethrow
, __get_object_from_ambiguous_exception(header
),
118 header
->exceptionType
);
121 #ifdef __USING_SJLJ_EXCEPTIONS__
122 _Unwind_SjLj_Resume_or_Rethrow (&header
->unwindHeader
);
124 #if defined(_LIBUNWIND_STD_ABI)
125 _Unwind_RaiseException (&header
->unwindHeader
);
127 _Unwind_Resume_or_Rethrow (&header
->unwindHeader
);
131 // Some sort of unwinding error. Note that terminate is a handler.
132 __cxa_begin_catch (&header
->unwindHeader
);